package com.first.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebFilter("/*")
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String uri = request.getRequestURI();
        if(uri.equals("/")||uri.contains("login")||uri.contains("layui")||uri.contains("img")||uri.contains("echart")){
            filterChain.doFilter(request,response);
        }else {
            HttpSession session = request.getSession();
            Object user = session.getAttribute("user");
            if(user==null){
                response.sendRedirect("../login.jsp");
            }else {
                filterChain.doFilter(request,response);
            }
        }
    }

    @Override
    public void destroy() {

    }
}
